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Is there a standard USSD string that I can use to test a random USSD gateway?

I am developing an application that sends a USSD message to the USSD gateway. However, I do not yet have an account for the owner of the gateway. However, I have several other accounts, and I would like to check if my USSD trading works well.

In this sense, is there a standard USSD command that I can send and understand and respond with any USSD gateway, regardless of the operator? If so, which one (s)?

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As you probably know, USSD means Unstructured Additional Service Data, and the message structure is determined by individual operators.

A quick look at the 3GPP 34.123 protocol test test, part 1 does not show any protocol tests with standard USSD strings.

The allowed USSD message formats are defined in TSPP 22.090 3GPP. Therefore, if you find some USSD dialogs that are valid for the operators with whom you have an account, you can check how your code works with the allowed USSD message formats (instead of specific lines).

You can also try these general call forwarding messages.

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